Overview
The TPS23881RTQR is an 8-channel power sourcing equipment (PSE) controller designed by Texas Instruments to comply with the IEEE 802.3bt standard for Power over Ethernet (PoE) applications. This controller is engineered to insert power onto Ethernet cables and can detect powered devices (PDs) with valid signatures, complete mutual identification, and apply power accordingly. It enhances the capabilities of its predecessor, the TPS23880, with improved features such as reduced current sense resistors, more accurate programmable power limiting, and capacitance measurement. The TPS23881RTQR is also compatible with TI’s FirmPSE system firmware, enabling a fully configurable solution for controlling multiple devices in systems offering up to 48 ports of 4-pair PoE power.
Key Specifications
| Parameter | Value |
|---|---|
| Package | 56-pin VQFN (RTQ) |
| Operating Temperature Range | -40°C to 125°C |
| Current Sense Resistor | 200 mΩ |
| Power Limiting Accuracy | ±2.5% |
| Current Sensing Accuracy | 2% |
| ADC per Port | 14-bit integrating current ADC |
| Port Power Allocations | Selectable 2-pair or 4-pair |
| Maximum Power per Port | Up to 90 W (expandable to 125 W) |
| PD Compatibility | Single and dual signature PD |
| Firmware Upgradability | Programmable SRAM over I²C |
Key Features
- IEEE 802.3bt PSE solution for PoE 2 Type 3 or Type 4 applications
- Eight independent PSE channels
- Compatible with TI’s FirmPSE system firmware
- SRAM Programmable memory for in-field firmware upgrades
- Programmable power limiting accuracy ±2.5%
- Legacy PD capacitance measurement
- Selectable 2-pair or 4-pair port power allocations
- Dedicated 14-bit integrating current ADC per port
- Noise immune MPS for DC disconnect
- 1- or 3-bit fast port shutdown input
- Auto-class discovery and power measurement
- Inrush and operational foldback protection
- Flexible processor controlled operating modes (auto, semi-auto, manual/diagnostic)
- Per port voltage monitoring and telemetry
- Ultra Low Alpha (ULA) packaging (TPS23881A)
Applications
- Enterprise switches and routers
- SoHo switches and routers
- PoE pass-through power modules
- Network video recorders (NVRs)
Q & A
- What is the TPS23881RTQR used for?
The TPS23881RTQR is used as an 8-channel power sourcing equipment (PSE) controller for Power over Ethernet (PoE) applications, complying with the IEEE 802.3bt standard. - How many power channels does the TPS23881RTQR have?
The TPS23881RTQR has eight independent power channels. - What is the operating temperature range of the TPS23881RTQR?
The operating temperature range is -40°C to 125°C. - What is the accuracy of the programmable power limiting?
The programmable power limiting accuracy is ±2.5%. - Can the TPS23881RTQR support both 2-pair and 4-pair PoE ports?
Yes, it supports both 2-pair and 4-pair port power allocations. - What is the maximum power that can be sourced per port?
The maximum power per port is up to 90 W, expandable to 125 W. - Is the TPS23881RTQR compatible with TI’s FirmPSE system firmware?
Yes, it is compatible with TI’s FirmPSE system firmware. - How does the TPS23881RTQR handle firmware upgrades?
The TPS23881RTQR allows for in-field firmware upgrades via programmable SRAM over I²C. - What kind of ADC does each port have?
Each port has a dedicated 14-bit integrating current ADC. - Does the TPS23881RTQR support noise immune DC disconnect?
Yes, it supports noise immune MPS for DC disconnect.
